Type.inheritsFrom Method
Determines whether an instance inherits from a specified class.
var isInheritedFromVar = TypeA.inheritsFrom(parentType);
Parameters
- parentType
The fully qualified name of the class to test as a base class for the current instance.
Return Value
true if the instance inherits from parentType; otherwise, false.
Remarks
Use the inheritsFrom method to determine whether a type inherits from a specific base type.
Example
The following example shows how to use the inheritsFrom method to determine whether one class inherits from another class.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="https://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Sample</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager runat="server" ID="ScriptManager1">
</asp:ScriptManager>
<script type="text/javascript">
// Register classes to test.
Type.registerNamespace('Samples');
Samples.A = function()
{
// Initialize as a base class.
Samples.A.initializeBase(this);
}
Samples.B = function(){}
Samples.C = function(){}
Samples.A.registerClass('Samples.A');
Samples.B.registerClass('Samples.B', Samples.A);
Samples.C.registerClass('Samples.C');
var isDerived;
isDerived = Samples.B.inheritsFrom(Samples.A);
// Output: "true".
alert(isDerived);
isDerived = Samples.C.inheritsFrom(Samples.A);
// Output: "false".
alert(isDerived);
</script>
</form>
</body>
</html>